When you execute a test page, !-FitNesse-! gathers up the html and passes it to FIT which runs the fixtures and colorizes the HTML appropriately.

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Create a simple test page

|Action Fixture.|
|start|Page Builder|
|enter|line|!-!path classes-!|
|enter|line|!-!path fitnesse.jar-!|
|enter|line|!-|!-fitnesse.testutil.PassFixture-!-!!-|-!|
|enter|page|!-TestPage-!|

Now run the test page.

|Response Requester.|
|uri   |valid?|
|!-TestPage?responder=test-!|true|

|Response Examiner.|
|contents?|
||

The bgcolor of the cell should turn green

|Response Examiner.|
|type  |pattern|matches?|
|contents|class="pass"|true|

The error log page should not have any errors

|Response Requester.|
|uri   |valid?|
|!-ErrorLogs.TestPage-!|true|

|Response Examiner.|
|contents?|
||

|Response Examiner.|
|type  |pattern|matches?|
|contents|Exit code.*0.*Time|true|
